GKFix MCQ Question

What is the mathematical expression for superposition of two waves?

• A. y(x,t) = y₁(x,t) × y₂(x,t)
• B. y(x,t) = y₁(x,t) - y₂(x,t)
• C. y(x,t) = y₁(x,t)/y₂(x,t)
• D. y(x,t) = y₁(x,t) + y₂(x,t)